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Share-based compensation - Summary of Classification of Stock-based Compensation in Consolidated Statements (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees $ 19,585 $ 3,295 $ 747
Subscription Cost [Member]      
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees 696 84 30
Services Cost [Member]      
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees 376 78 77
Sales And Marketing [Member]      
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees 5,530 991 182
Research And Development [Member]      
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees 5,896 1,131 271
General And Administrative [Member]      
Expense From Share Based Payment Transactions Alternative [Line Items]      
Expense from share-based payment transactions with employees $ 7,087 $ 1,011 $ 187